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- W2566457653 abstract "MicroRNAs (miRNAs) have been improved to regulate oocyte development in a cell- or stage-specific manner. In this study, we aimed to clarify microRNA-224′s (miR-224) role in cumulus cells (CCs), to find out whether a change level of miR-224 in CCs could influence the maturation of oocyte. We found that overexpression of miR-224 of CCs led to the impairment of cell expansion, along with a decrease in the gene expression associated with cell expansion and maturation of oocyte. The increased expression of miR-224 in CC interrupted oocyte cell cycle at the GV stage. The GDF9, BMP15 and ZP3 of the oocytes were also down-regulated. The following in vitro fertilization had yielded a lower number of oocytes from cumulus-oocyte complexes (COCs) overexpressing miR-224 when reaching the blastocyst stage. The suppressive effect of miR-224 in the maturation of COC is validated by the miR-224 knockdown model, where the expansion of cumulus cell was increased and oocyte was developed to MII stage. In addition, the expression of aromatase in CCs was down-regulated by miR-224, resulting in a decreased level of estradiol (E2). A further investigation found that miR-224 down-regulated the expression of protein and mRNA of Ptx3 by targeting its 3’UTR. Our study revealed that miR-224 regulates the gene expression and function of CCs, which influences the maturation of oocyte, at least in part, via targeting Ptx3." @default.
- W2566457653 created "2017-01-06" @default.
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- W2566457653 date "2017-02-01" @default.
- W2566457653 modified "2023-09-25" @default.
- W2566457653 title "MicroRNA-224 delays oocyte maturation through targeting Ptx3 in cumulus cells" @default.
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- W2566457653 doi "https://doi.org/10.1016/j.mod.2016.12.004" @default.
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